Coal stoker



March 1, 1938. v. c. NORQUIST COAL STOKER Filed Jan. 18, 1954 INVENTOR V/bfar C. Marya/Is? J/a W A ORNE Y Patented Mar. 1, 1938 UNITED V STATES PATENT OFFICE Application January 18, 1934, Serial No. 707,083

1 Claim.

My invention relates to coal stokers and more particularly to a coal stoker construction in which the coal hopper is laterally offset from the furnace door, permitting access thereto.

In automatic coal stokers for use in the home, hotels, apartments and the like, a coal hopper is usually provided in line with a coal duct in which a conveying screw is positioned. For small stokers the coal duct is usually short and positioned directly in front of the furnace. This makes access to the furnace door dificult for the removal of clinkers, ashes and the like. The hopper must be positioned a suificient distance away-from the door to permit the door to be opened. This necessitates the use of a sufficiently long coal duct and conveyer screw. Furthermore, the hopper cannot be made too large as it will interfere with the removal of clinkers through the furnace door. 7

One object of my invention is to provide a coal stoker construction in which the coal hopper is laterally offset from the coal duct.

Another object of my invention is to provide a coal stoker, in which easy access may be had to.

the furnace door.

A further object of my invention is to provide a coal stoker in which the coal feeding duct may be made shorter than has hitherto been possible.

A still further object of my invention is to In .the accompanying drawing, which forms part of-the instant specification, and which is to be read in conjunction therewith, and in which like reference numerals have been used to indicate like parts in the various views, I

Fig. 1 is a sectional elevation of a construction embodying one form of my invention.

Fig. 2 is a plan view of the hopper and the hopper end of the coal duct.

Fig. 3 is a sectional view taken on the line 3-3, Fig. 1.

means for feeding coal from the hopper to the coal duct.

In general, my invention contemplates a stoker construction in which a combustion pot is positioned within a furnace casing, having a door. The coal duct containing a conveyer screw is in line with the combustion pot and the door. The coal hopper is laterally offset from the coal duct and provided with a communicating means for leading coal to the coal duct. Means are pro- Fig. 4 is a detailed sectional view showing the vided for causing the coal to pass from the coal hopper to the coal duct, which means is actuated from the coal feeding screw in the coal duct.

More particularly; referring now to the drawing, a furnace casing l is provided with a door 2. A combustion pot is positioned within the casing I. A coal duct 4 houses a conveyer screw 5 which is adapted to feed coal to the combustion pot 3. Grates 6 are positioned around the combustion pot 3. Air is furnished to the combustion pot through conduit 1. A motor 8 drives the conveyer screw 5 through a transmission gearing which is housed in casing 9. A blower fan l0 driven by motor 8 furnishes air to air duct I. A coal hopper II is positioned laterally offset from the coal duct 4, as can readily be seen by reference to Fig. 3. It will be noted that the hopper II is clear of the furnace door 2. The bottom of hopper ll is'formed by inclined wall l2. It will be understood, of course, that the inclined wall may be of any suitable length and provided with adjacent housing walls to form a passageway extending at right angles, or substantially right angles, to the longitudinal am's of the coal feeding screw 5. Adjacent the bottom I2 of the hopper ii, I position means for moving coal from the hopper to the coal feeding screw.

Referring to Figs. 2, 3 and 4, it will be noted that in a suitable cylinder-like bearing l4 and bearing I5, I mount a member 16 provided with arms l1, l8 and I9 extending at right angles to a line drawn between bearings 14 and I 5. Secured to shaft 20 of the conveyer screw 5 is an eccentric 2| against which a bearing insert 22 is adapted to be pressed by spring 23 within cylinder ll. The insert 22 may be of any suitable bearing metal and is so arranged that it may be tion will tend to cause coal to move in the di-* rection of the coal feeding screw, the shape of arms I I, I8 and 19 being such that movement toward the left, looking at Fig. 4, will be easier than movement toward the right. The movement toward the right will cause coal to move in that direction toward the coal feeding screw.

It will be seen that I have accomplished the objects of my invention. I have provided a compact stoker construction which enables me to provide a coal hopper laterally offset from the furnace door. In this manner I may make the coal duct '4 shorter than has hitherto been possible. Likewise I may make the coal hopper larger inasmuch as it will not hinder the. removal of clinkers throughthe door 2. The construction is such that no additional prime mover independent of that which drives the main coal feeding screw 5 is required.

It will be understood that certain features and sub-combinations'are of utility and may be employed without reference to other features and sub-combinations. This is contemplated by and is within the scope of my claim. It is further obvious that various changes may be made in details within the scope of my claim without departing from the spirit-of my invention. It

is, therefore, to be understood that my invention is not to be limited to the specific details shown and described.

Having thus described my invention, what I claim is:

A coal stoker including in combination a furnace casing having a door, a coal duct leading to said casing in line with said door, a conveyor screw in said coal duct, a hopper laterally offset from said coal duct in position clear of said door, means for rotating said screw, a passageway connecting said hopper and said coal duct, reciprocating means in said passageway for moving coal from said hopper to said duct, a spring, an eccentric driving said reciprocating means in one direction against the action of said spring, and said spring moving the reciprocating means in the opposite direction.

VICTOR C. N ORQUIST. 

